Chp 8 - Graphical User Interface ( GUI )

Question 1

What is a GUI?

Answer 1

Graphical windows providing user interaction, accepting keyboard and mouse input.

Question 2

Name common GUI components.

Answer 2

1. Buttons
2. Labels
3. Text fields
4. Check boxes
5. Radio buttons
6. Combo boxes
7. Sliders

Question 3

What is AWT?

Answer 3

Abstract Window Toolkit: Java classes for graphics and GUIs; native component consistency

Question 4

AWT limitation?

Answer 4

1. Offers only components common across OSs
2. Limited extensibility

Question 5

What is Swing?

Answer 5

Library of Java classes (JFC) providing richer, extensible GUI components.

Question 6

Swing advantages?

Answer 6

1. Consistent look across OSs
2. Pedictable behavior
3. Easily extended components

Question 7

What is event-driven programming?

Answer 7

Programs react to events like button clicks; control driven by events.

Question 8

What is an event listener?

Answer 8

Object executing methods automatically when specific events occur.

Question 9

How to import Java Swing?

Answer 9

import javax.swing.*;

Question 10

How to import Java AWT

Answer 10

import java.awt.*

Question 11

What are Container and Component?

Answer 11

Component is a GUI element; Container holds components or other containers.

Question 12

How to create a Swing window?

Answer 12

Create a JFrame, add components to its content pane, show frame

Question 13

What is a top-level container class?

Answer 13

JFrame

Question 14

How to create a window by inheritance?

Answer 14

Extend JFrame and set up UI in constructor.

Question 15

Three fundamental Swing components?

Answer 15

1. JLabel
2. JTextField
3. JButton

Question 16

What does Swing Components begins with?

Answer 16

J

Question 17

What is JLabel?

Answer 17

Displays text

Question 18

What is JTextField?

Answer 18

Single-line user input area

Question 19

What is JButton?

Answer 19

Clickable button triggering actions

Question 20

What is JPanel?

Answer 20

Container to group related components; panels added to content pane

Question 21

What is an event object?

Answer 21

Object containing information about an event; created by source component

Question 22

What interface must an action listener implement?

Answer 22

ActionListener with method actionPerformed(ActionEvent e)

Question 23

How to register an action listener?

Answer 23

Call component.addActionListener(listener)

Question 24

Name two ActionEvent methods.

Answer 24

1. getSource()
2. getActionCommand()

Question 25

How to create a radio button?

Answer 25

1. new JRadioButton(String) 2. new JRadioButton(String, boolean selected)

Question 26

How to group radio buttons?

Answer 26

Use ButtonGroup to make selection mutually exclusive

Question 27

Are ButtonGroup containers?

Answer 27

No; not containers. Add buttons to panels separately

Question 28

How to create a JCheckBox?

Answer 28

1. new JCheckBox(String) 2. new JCheckBox(String, boolean selected).

Question 29

What event does JCheckBox generate?

Answer 29

ItemEvent when selected or deselected

Question 30

What must an item listener implement?

Answer 30

ItemListener with method itemStateChanged(ItemEvent e)